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Why would anyone put 318 heads on a 340?? Makes me question the rest of the build ... Sounds like a basket case don't buy only valuable thing here is the 340 block itself

Your going to have to replace valve spring know matter what you do if your doing it right ... I would put a different cam then that one make it worth your while but that's just me . I like this cam for close to stock applications I had one on my stock 73 340 worked well for me...

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Would be down for a possible trade for a 742 or 489 sure grips in 3.23 or 3.91

Here is a clutch type 742 case center 2.94 gear I am located in Toledo Ohio would prefer local pick up 550$

thats not 100% true i ran Lunati's # 10200702 with the 1.6 rockers prolly round 509 intake and 528 on exhaust for lift. so yes i went up in cam size and i am not saying there are not better cams out there i was just stating my experience with the cams i have run in my passed. lilredrooster...

I would not buy cross crap intake and I ran a real Eddy air gap on a mosty stock 340 1.88 valve it ran better then the stock ... My mosty stock 340 responded well to a Eddy air gap intake and its good intake if you end up grading your motor in the future

i have not had the car on a dyno or been down the track with it yet . they only way i can gauge the power is racing my friend in his 89 fox mustang back in 2006 my motor 73 340 with 8.5 to 1 was rebuilt to stock spec expt for a comp cam part kit # SK20-223-3 he told me his mustang ran high 13s...

my 340 is stock stroke i had hughes port my eddy air gap intake and my elebrock rpm heads i had them put a 208 valves in flows 300 cfm at .500 lift power difference for me was night and day i paid 1200$ for a pair of heads and about 1200$ in head work but was worth it i have not had my car on...

I have the 340 whiplash cam in my car sounds awesome as far as performance I had a comp cam and lunati both cams around 480 lift the whiplash cam is 549 lift because I am running 1.6 rockers out of all the cams i have run the whiplash has had the most power out of any of them prolly not going to...

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Are you guys local or Will to meat near San Diego ? I would to the 3.23 trade but I would need a little cash on top ... I mean a 741 case is not worth what a 742 and 489 case is

More pictures for those who wanted them

8 3/4 center section strong 742 case with 3.55 gears not many miles on it pulled it from my challenger its in very good condition local pick up for San Diego 650$ I would also be interested in a trade for a suregrip in a 3.23 or 3.91 in a 742 or 489 case

Sell it separately the center section is worth easy 500$ not hard sell at all ! These suregrips are getting hard to find the junk yards around me are all cleaned out the days. Of finding them for 300-400$ are pretty much over unless you find some that has no idea on what they have I sold one for...

Yes there used I have no idea how many miles are on them but I thank you for the information looks like these Will work out good for my car thanks for the info guys !

Anyone know where I can find info on 741 and 742 case preload requirements ?

I am trying to figure out why my 741 case is easier to spin /turn then my 742 case I checked the lash which is fine according to the hot rod magazine article I was reading. I stuck a gauge to the back of the nut that holds the yoke down and spin it .the 741 case was 14 inch pounds and the 742...

No rust on the teeth that I can see of anyone know the torque spec for the nut that holds the yoke on ?

One is a 3.91 is the 741 case and the other is a 3.55 742 case

So I two 8 3/4 center section one is a 741 the other a 742 I noticed when I turned both of them one is alot easier to turn then the other . I put them both up to dial indicator and noticed that the lash is set correctly on the both of them . why would one have less resistance to turn than the...

I have those same mufflers on my 340 sounds just amazing with headers and a whiplash cam . almost everyone thinks its a 440 everywhere I take it .

Go with the LA eddy heads closed chamber they out flow stock Magnum heads and if you want more flow Hughes got my eddy LA heads flowing 300cfm at .500 lift after porting

Thinking about putting a aluminium drive shaft in any one use these guys ? http://www.driveshaftspecialist.com/

Umm so with the large yoke I can run larger u jonts ? My 340 is stock stroke I don't think its putting out the torque your 540 is. And I am not running a trans break only a 3000 stall

I hate auto correct ... Lol

Is there a large different between strength in a small to a large yoke for a 8 3/4 rear ? I been running 500hp in my 340 with no problemes yet and have a small yoke on it. Iam looking to up grade my tires should I invest in some larger yolks ?

I Beautiful car ! I put Eddy closed chambered heads on my 73 340 sold my 302 heads for 400$ and love my new heads. Let me know if you ever want to sell your aluminium slot rims I have cash $ :)

Thanks for the in put I swap rear ends out a lot I have 2 8 3/4 3rd members one 3.23 and one 3.91 one I use for the street one for the track

Looking for the best gear oil for my 8 3/4 suregrip what weight should I run? the guys at auto zone tell me 70w but I do not trust them ! Any any particular brands or additives I should add thank you